Cylinder-lapping tool



E. S. KARSTENS CYLINDER LAPPING TOOL [NVENTUR I TTUR/\/ 'Y$ Filed Feb. 28-, 1920 Patented Jan. 2@, l925.

UNETEE @TATES EDWARD S. KARSTENS, OF DAVENPORT, IOWA.

CYLENDER-LAPPING TOOL.

Application filed February 28, 1920. Serial No. 362,026.

To all whom it may concern:

Be it known that I, EDWARD S. KARs'rnNs, a citizen of the United States, residing at Davenport. in the county of Scott and State 5 of Iowa, have invented certain new and useful Improvements in Cylinder-Lapp ng Tools, of which the following is a specification.

My invention relates to improvements n 1 tools designed to hold stones for lapping 1n cylinders, cylindrical objects, etc and the objects of my improvement are, first, to provide a cylinder lapping tool that can be conveniently and readily used in boring mills, drilling machines, lathes, etc; second, to provide a simple cylinder lapping. tool in which the stones are spring held into contact with the interior face of the cylinder; third, to provide a cylinder lapping tool in which the'stones are readily replaced; and, fourth, to provide a cylinder lapping tool which can be readily and easily adjusted to the desired size and in which the stones are automatically equalized as to pressure throughout their entire length.

I attain these objects by the means illustrated in the accompanying drawing, in which Figure l is a side elevation of the tool,

showing stoneholders, springs and part of the adjusting thread in dotted lines: Fig. 2, a reduced detail of one of the lapping stones and its holder; Fig. 3, a cross section on the line 1 Fig. 1; Fig. 4, a cross section on the line ma:, Fig. 1; Figures 5 and 6, de-

tails of the fixed collar; and Figures 7 and 8, details of the adjusting collar.

Similar numerals refer to similar parts throughout the several views.

The body 1 of the appliance is substantially cylindrical, having both ends tapered and one end extended to form a threaded portion7, and a tapered shank 8. A plurality of channels are formed in the body of the appliance extending longitudinally thereof, adapted to receive the stoneholders 3. The stoneholders are the same length as the longitudinal channels in the body of the appliance and extend from end to end thereof.

Each stoneholder has a flat intermediate portion with triangular ends formed integral-therewith and the inner faces of such ends preferably form an acute angle with the body of'the stoneholders.

The stones for use in the appliance are shaped to conform to the size and shape of the space between the ends of the stoneholders and to extend somewhat beyond the outer points of the ends, so as to operate upon the inner face of the cylinder without allowing the outer points of the stoneholder ends to scratch the face of the cylinder.

The outer faces of the ends of each stoneholder are formed with a facial curve equal to the curve of the adjoining portions of the body of the appliance.

A. fixed collar 5, is secured to one end of the body of the appliance by set-screws 5 or other suitable means and secures one end of the stoneholders in their respective channels.

The opposite end of the stoneholders is retained by an adjusting collar 6, the body of which is formed to correspond to the sloping end of the body of the appliance and adjacent ends of the stoneholders, and which has a threaded portion by which it can be secured upon the shank end of the appliance and adjusted by turning upon the thread as required. 4

Holes are bored through the body of the appliance to receivesprings 4 and 4, the

ends of which press against the stoneholders and tend to force them outward at a pressure which may be varied by using springs of varied resistance.

The angles of the inner faces of the collars 5 and 6, and of the adjacent ends of the stoneholders, are such that the pressure of the springs tends to force the stoneholders outwardly at a uniform distance from the longitudinal axis of the appliance, and these angles, as well as the angles of the inner faces of the stoneholders, may be varied as required by difierent classes of work and qualities of stone used.

In operation, the stones-2 are placed in the holders 3. The holders are then placed in position in the channels of the body of the appliance and the collar 5 secured in place by set-screws 5. The collar 6 is then screwed upon the threaded portion 7 of the appliance and adjusted in any desired position. The tapered shank 8, is then placed in the tool holder of a boring mill, drill or other machine and operated in the usual way.

My appliance can be used both for rotary and longitudinal motion as well as for a combination thereof, and the arrangement of the springs, stones, stoneholders and collars, is intended to make it automatically self-centering and equalizing. The innerfaces of the ends of stoneholders ma be substantially, at right angles to the lzod and the outer faces ma be nearly at right angles to the body if esired, as shown in dotted lines in Fig. 2. It is obvious that having tapered ends, of longitudinal channels formed in said body, stoneholders seated in said channels, having their ends bevelled to correspond to the taper of the adjacent portions of the ends of the body, an internally bevelled fixed collar secured at one end of the body, and an internally bevelled movable collar secured at the other end y thereof, means for adjusting the position of the movable collar longitudinally, and spun s seated in transverse openings in said body etween pairs of opposite stoneholders.

2. In an appliance for lapping in cylinders, the combination with a body havin tapered collars secured at the ends thereo of stoneholders having ends bevelled to correspond to the tapered collars mounted between the collars and a plurality of compression springs seated in suitable openings at opposite ends of the body, each spring bearing outwardly against two oppositely located stoneholders. v

In testimony whereof I aflix my signature.

.EDWVARD S. KARS'IENS. 

